The commands markdown-open and markdown should provide a meaningful error message when markdown-open-command and markdown-command fail or don't exist, respectively.
Both commands silently do nothing if the external subprocess fails. In addition, markdown silently does nothing if the program file doesn't exist.
In a Markdown buffer:
(let ((markdown-command "/bin/false")) (markdown))
(let ((markdown-command "/does/not/exist")) (markdown))
(let ((markdown-open-command "/bin/false")) (markdown-open))
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